<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			*{
				margin: 0;
				padding: 0;
			}
			html,body{
				height: 100%;
				overflow: hidden;
			}
			
			#test{
				width: 600px;
				height: 400px;
				border: 1px solid;
				border-radius:50%;
				text-align: center;
				font: 30px helvetica;
				line-height: 400px;
				position: relative;
			}
			#test:after{
				position: absolute;
				display: block;
				content: "";
				width: 80px;
				height: 80px;
				border: 1px solid;
				bottom: -20px;
				right: -20px;
				border-radius:50%;
			}
			#test:before{
				position: absolute;
				display: block;
				content: "";
				width: 60px;
				height: 60px;
				border: 1px solid;
				bottom: -100px;
				right: -100px;
				border-radius:50%;
			}
		</style>
	</head>
	<body>
		<div id="test">大家好，欢迎入坑前端</div>
	</body>
</html>
